Preparation and characterization of novel environmentally friendly Al2O3/SiO2/CaO ceramic foams

0494817 - ÚFM 2019 RIV GB eng J - Článek v odborném periodiku
Bertolla, Luca - Chlup, Zdeněk - Tatarko, P. - Hanzel, P. - Ševeček, O. - Roupcová, Pavla - Dlouhý, Ivo
Preparation and characterization of novel environmentally friendly Al2O3/SiO2/CaO ceramic foams.
Ceramics International. Roč. 44, č. 15 (2018), s. 19063-19069. ISSN 0272-8842. E-ISSN 1873-3956
Grant ostatní: AV ČR(CZ) SAV-18-12
Program: Bilaterální spolupráce
Institucionální podpora: RVO:68081723
Klíčová slova: Porous ceramics * Silicates * Thermal diffusivity * Compressive strength
Obor OECD: Ceramics
Impakt faktor: 3.450, rok: 2018

Low-cost Al2O3-SiO2-CaO ceramic foams were prepared using a novel and simple reactive foaming process. The foamed green bodies were produced by mixing aluminium powder and calcium hydroxide in an aqueous solution of sodium silicate and sintered in an argon atmosphere using a pressureless electric current assisted process (T = 800 C). An additional thermal treatment was performed in air using a conventional furnace (T = 1050 degrees C) in order to oxidize the residual metallic phases. The resulting foams exhibited open porosity, densities ranging from 0.50 to 0.65 g/cm(3) and wide pore size distribution (0.04-400 mu m). The compressive strength and thermal diffusivity of these foams ranged from 2.12 to 1.01 MPa and from 0.27 to 0.45 mm(2)s(-1), respectively, which indicate their suitability as thermal insulator materials.
Trvalý link: http://hdl.handle.net/11104/0288004